Water-circulating device.



PATBNTED AUG. 2, 1904.

G. KIMBALL.

WATER CIRGULATING DEVICE.

APPLICATION FILED NOV. 2, 1903.

2 SHEETS-SHEET 1.

N0 MODEL.

wf/74m( PATENTED AUG. 2, 1904.

G. KIMBALL.

WATER GIRCULATING DEVICE. A

APPLICATION FILED NOV. 2.1903.

2 SHEETS-SHEETVR.

I0 MODEL.

l .y l l UNITED STATES Patented August 2, 1904.

PATENT QEEICE.

WATER-CIRCULATING DEVICE.

SPECIFICATION forming part of Letters Patent No. 766,448, dated August 2, 1904. Application filed November 2, 1903. Serial No. 179,589. (No model.)

To /r/Z N71/(mt it m/rtl'l/ concern:

Be it known that I, GRANVILLE Kumara., a citizen of the United States, and a resident of Chicago, in the county of Cook and Statel of Illinois, have invented certain new and useful Improvements in rater-Cireulating Devices for Steam-Boilers; and I do hereby declare that the following' is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which forma part of this specification.

This invention relates to improvements in means for circulating' the water in steamboilers, and more especially to devices within the boiler by which the water delivered thereto by a feed-pump or injector operates to produce a circulation of water within the boiler.

The invention is herein shown as applied to an internally-tired Scotch marine boiler; but thesameis equally applicableto internallylired boilers of other types or forms of construction.

The invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the drawings, Figure l is a view in central longitudinal section of a boiler embodying my invention. Fig. '2 is a cross-sectional view thereof,v taken upon line 2 2 of Fig. l.

As shown in the said drawings, A A' indicates the heads of the boiler, and A2 the cylindric shell thereof.

B is a flue which extends between the heads ofthe boiler and contains the lire-grate CU' and a bridge-wall l). The boiler is provided at the sides and above the flue B with returntubes E E, which lead from the combustionchamber D at the rear end of the boiler to an uptake E/ at the forward 'end thereof. The heads A A are shown as connected with each other above the tubes C by means of staybolts F F.

Now referringto the particular feature constituting' my invention, the same is embraced in a water-supply pipe by which the feed-water is delivered to the interior of the boiler and which extends throug'h the upper part of the boiler or that in which the temperature is highest and terminates in a discharge end located at the section of the boiler beneath the internal furnace-flue or fire-box, which is the coolest part of the water-space of the boiler, so that the feed-water will be heated in its passage through the feed-pipe and will be discharged after being' so heated at the bottom or coolest part of the water-space of the boiler. Said water-supply pipe, as shown in the accompanyingdrawings, embraces several parts or sections, as follows, to wit: a short section (ir. which passes through the shell of the boiler near its forward end; alongitudinal section or part G, which extends horizontally along the side of the boiler-shell in a plane slightly above the level of the top ofthe retm'n-tubes E from the section (vr to a point near the rear end of the boiler; a horizontal transverse part G2, which extends horizontally across the boiler near the rear end thereof, another longitudinal horizontal part or section G3, which extends forwardly along the opposite side of the boiler to a point near the forward end of the boiler, and a cm'ved part or section G, which extends downwardly from the forward end of the section (i3 along' the inner surface or shell of the boiler to a point beneath the ilueB and which discharges at a point between the bottom of the boiler-shell and the bottom of said flue. Said section G" is preferably provided with a forwardly-extending end portion (Jrr, as seen in Fig. l, which terminates near the front head A of the boiler.

To facilitate the introduction and removal of the feed-pipe described, it may be provided in its longitudinal parts G' and G with joints f/ g, formed by iiang'es on the ends of the parts of the pipe, which flanges are joined by bolts inserted therethrough. The descending part iVAL of the feed-pipe is also preferably jointed or made ofjoined sections. The drawingshowing the same is provided with a detachable screwjoint g/, consisting' of an internally-screwthreaded sleeve engaging' the adjacent screwthreaded ends of the parts of the pipe, said sleeve and the ends of the pipe` being oppositely screw-threaded or provided with right and left screw-threads, so that the sleeve may be applied and removed b v turning the same on the said ends of the pipe.

It is well understood that in all internally- IOO fired boilers or those in-which the furnace is located within a Hue or tire-box which is within and surrounded bythe extern'al shell of the boiler the portion of the water-space of the boiler least subject to the heat from the furnace and which is therefore the coolest is that at the forward end of the boiler beneath the furnace-Hue or lire-box. In the Operation of the device embodying my invention the feed-*water is delivered to this coolest partof the water-space of the boiler from the feedpipe; but said feed-pipe is made of considerable length within the boiler and is carried for a considerable distance through the upper or hottest part of the boiler before it descends to the point of discharge. As a' result of this construction the entering water is heated in its circulation through the portion Of the feedpipe located in the hotter parts of the boiler, so that it reaches a high temperature before it makes its exit from the end of said feedpipe and is discharged into the water-space. It follows that by the construction described a constant supply of water at high temperature is afforded toa cooler part of the waterspace of the boiler beneath the furnace-Hue or fire-box, and an increased circulation of water in the boiler thereby results.

The construction produces the result of causing a constant circulation of water through and from the space beneath the furnace-Hue or fire-box, where the water is usually dead or has no movement or circulation, and in the parts of the boiler above the same, with the manifest advantage of making the general circulation of water in the boiler more positive and rapid, with corresponding advantage in the enhancement of steam-producing capacity.

l claim as my inventionl. The combination with an internally-fired boiler having a furnace-containing Hue Or firebox located within the shell thereof, of a feedwater pipe leadingI from the exterior of the boiler, and provided. within the boiler, with an upper part consisting of along horizontal pipe located in the part of the boiler above said Hue or fire-box, and with adescending part which leads to and discharges into the space beneath the bottom of said Hue or Hre-` box; said pipe being closed within the boiler except at its discharge end.

2f The combination with an internally-fired boiler having a furnace-containi ng Hue or firebox in its lower part and return Hues Or tubes above the same, a feed-water pipe leading from the exterior of the 'boiler and provided within the boiler with an vupper part consisting Of a long horizontal part located above the level of said return-Hues, and with a descending part which leads to and discharges into the space below the bottom of said furnace-Hue or fire-box, said pipe being closed within the boiler except at its discharge end.

3. The combination with a boiler having a furnace-Hue or fire-box and return Hues or tubes, of a waterfeed pipe which passes through the shell of the boiler near the front end thereof and has a horizontal part which extends backward along one side of the boiler, across the boiler near its rear end and then forwardly along the other side of the boiler, and a descending part which extends downwardly from the front end of said horizontal part and terminates beneath the forward Hue or fire-box near the front end of the boiler'.

In testimony that I claim the foregoing as my invention I affix my signature, in presence of two witnesses, this 27th day of October,

p GRANVILLE KIMBALL. vWitnesses: C. CLARENCE POOLE,

GEORGE R. VILKINS. 

